TrailRunSim is a trail running simulator designed to help you plan realistic race strategies. You can start immediately by selecting one of the preset trail races — no GPX file required. The simulator provides pace predictions, elevation insights, cutoff risk analysis, and aid station timing to support both beginners and experienced runners.
Most runners begin by choosing a preset course. These presets include popular domestic and international trail races with pre‑loaded distance, elevation, and aid station information. Once you select a preset, TrailRunSim automatically:
This allows you to plan your race even if you don’t have a GPX file.
If you want to analyze your own custom route, you can upload any GPX file. TrailRunSim will generate an elevation profile, effort‑based pace estimation, cutoff risk prediction, and section‑by‑section difficulty. GPX upload is optional — the simulator works perfectly with presets alone.
Trail running involves steep climbs, long descents, altitude changes, and tight cutoff times. TrailRunSim helps you understand the real effort behind every kilometer so you can avoid early burnout and finish strong. It is useful for both beginners and experienced runners preparing for domestic or international trail races.